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Set Combobox SelectedValue to null

Question

Basically I've got a small problem with the combobox. When the window is loaded this combobox is populated from a database... There is a radiobutton righ underneath the combobox and if the radiobutton is checked the combobox shouldn't have any selected
value....

I've tried a few things like:

combobox.SelectedIndex = -1;

combobox.SelectedValue = 0; and a few others...

But none of them seems to work... Does anybody know how to do this without clearing the combobox and repopulating it again?